E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/38
E21B 33/138 (2006.01) E21B 43/02 (2006.01)
Patent
CA 1266429
ABSTRACT There is disclosed a process for transforming an unconsolidated formation surrounding a borehole into a consolidated state for the prevention of the migration of small particles during the removal of fluid from the bore- hole. The formation is heated to a predetermined tempera- ture capable of supporting low temperature oxidation by heating a heavy crude oil above ground surface and then injecting the heated crude oil into the borehole. Precipi- tation of asphaltenes in the formation is then achieved by injecting unheated air into the borehole, and this results in consolidation of the formation. The heavy crude oil may be heated to a temperature of about 100°C which, when injected into the formation surrounding the borehole, brings the formation up to a temperature of about 35°C to 50°C prior to the injecting of air at atmospheric temperature. The process is economical to carry out as compared to known processes, particularly because it can be carried out in any type of well without the need of any elaborate equipment. The resulting consolidation is permeable and yet permanent.
541050
Home Oil Company Limited
Parks Thompson & Macgregor
LandOfFree
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